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Topic: Sea level

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In the News (Tue 16 Jul 19)

  USGS FS 002-00: Sea Level and Climate
Climate-related sea-level changes of the last century are very minor compared with the large changes in sea level that occur as climate oscillates between the cold and warm intervals that are part of the Earth's natural cycle of long-term climate change.
During cold-climate intervals, known as glacial epochs or ice ages, sea level falls because of a shift in the global hydrologic cycle: water is evaporated from the oceans and stored on the continents as large ice sheets and expanded ice caps, ice fields, and mountain glaciers.
Sea levels during several previous interglacials were about 3 to as much as 20 meters higher than current sea level.
pubs.usgs.gov /fs/fs2-00   (1003 words)

  Sea level rise due to global warming - Climate Change   (Site not responding. Last check: )
In the conventional tide-gauge system, the sea level is measured relative to a land-based tide-gauge benchmark.
It is likely that much of the rise in sea level has been related to the concurrent rise in global temperature over the last 100 years.
The rate of observed sea level rise suggests that there has been a net positive contribution from the huge ice sheets of Greenland and Antarctica, but observations of the ice sheets do not yet allow meaningful quantitative estimates of their separate contributions.
www.grida.no /climate/vital/19.htm   (296 words)

  sea level. The Columbia Encyclopedia, Sixth Edition. 2001-05
Theoretically, one would expect sea level to be a fixed and permanent horizontal surface on the face of the earth, and as a starting approximation, this is true.
Locally the levels of the surface of the world’s oceans are disturbed by wind-driven waves and tides.
Sea level therefore fluctuates in periods ranging from seconds to a year as a result of these factors.
www.bartleby.com /65/se/sealevel.html   (503 words)

 Sea level - Wikipedia, the free encyclopedia
To an operator of a tide gauge, MSL means the "still water level"—the level of the sea with motions such as wind waves averaged out—averaged over a period of time such that changes in sea level, e.g., due to the tides, also get averaged out.
In a state of rest or absence of external forces, the mean sea level would coincide with this geoid surface, being an equipotential surface of the Earth's gravity field.
The subsidence of land due to the withdrawal of groundwater is an isostatic cause of relative sea level rise.
en.wikipedia.org /wiki/Sea_level   (942 words)

 Sea level rise - Wikipedia, the free encyclopedia
Sea level rise is an increase in sea level.
Observational estimates are that the rise in sea level due to rising temperature is about 1 mm/yr over recent decades.Observational and modelling studies of mass loss from glaciers and ice caps indicate a contribution to sea-level rise of 0.2 to 0.4 mm/yr averaged over the 20th century.
Based on tide gauge data, the rate of global average sea level rise during the 20th century lies in the range 0.8 to 3.3 mm/yr, with an average rate of 1.8 mm/yr.
en.wikipedia.org /wiki/Sea_level_rise   (5234 words)

 PSMSL - Frequently Asked Questions
The sea level itself can change (sea level is believed to have increased by between 10 and 20 cm during the last 100 years) and land levels can change due to geological reasons.
Sea level is about 20 cm higher on the Pacific side than the Atlantic due to the water being less dense on average on the Pacific side and due to the prevailing weather and ocean conditions.
Global-average sea level is believed to have risen by between 10-20 cm during the past century and best estimates are that it will rise by approximately 50 cm in the next 100 years (i.e.
www.pol.ac.uk /psmsl/puscience/index.html   (3125 words)

 Sea Level
The global sea level has already risen by around between 10 to 25 centimetres during the last 100 years, at the rate of 1 to 2 millimetres per year.
It is likely that most of this rise in sea level has been due to the increase in global temperature over the last 100 years.
Another complication is that the sea level would not rise by the same amount all over the globe due to the effects of the Earth’s rotation, local coastline variations, changes in major ocean currents, regional land subsidence and emergence, and differences in tidal patterns and sea water density.
www.ace.mmu.ac.uk /eae/Global_Warming/Older/Sea_Level.html   (470 words)

 Sea level
To an operator of a tide gauge, MSL means the 'still water level' - the level of the sea with motions such as wind waves averaged out - averaged over a period of time such that changes in sea level - e.g.
Mean sea level at the Pacific end of the Panama Canal stands 20cm higher than at the Atlantic end.
In the UK, mean sea level is defined at Newquay in the county of Cornwall.
www.brainyencyclopedia.com /encyclopedia/s/se/sea_level.html   (466 words)

 sea level on Encyclopedia.com
SEA LEVEL [sea level] the level of the sea, which serves as the datum used for measurement of land elevations and ocean depths.
Global sea level has been rising at an increased rate over the past 130 years; A 20th century acceleration in the rate of sea-level rise.
Dead Sea, salt formation due to level being drained for re-irrigation and re-purification.
www.encyclopedia.com /html/s1/sealevel.asp   (1534 words)

 CSR TOPEX/POSEIDON Global mean sea level results   (Site not responding. Last check: )
Long term mean sea level change is a variable of considerable interest in the studies of global climate change.
The measurement of long term change in global mean sea level would provide important corroboration of predictions by climate models of global warming as a result of an increase in the "greenhouse" gases.
Most recent estimates of global mean sea level rise from tide gauge measurements range from 1.7 to 2.4 mm/yr.
www.csr.utexas.edu /gmsl/main.html   (189 words)

 Ocean ESIP Sea Level Data and Altimetry   (Site not responding. Last check: )
Sea level and its horizontal slope and time changes are the surface expression of ocean processes occurring over large spatial and temporal scales.
Sea level also provides evidence of local heating by solar radiation, the perennial tides, and the addition of water to the ocean by melting ice caps or glaciers.
It now may be feasible to monitor the rise of the global sea level and its potential acceleration, to an accuracy of 1 mm/yr or better.
oceanesip.jpl.nasa.gov /sealevel   (487 words)

 Sea level rise due to the melting of mountain and subpolar glaciers - Maps and Graphics at UNEP/GRID-Arendal
Observational and modelling studies of glaciers and ice caps indicate an average sea level increase of 0.2 to 0.4 mm/yr during the 20th century.
Sea level rise due to the melting of mountain and subpolar glaciers.
Sea level rise due to the melting of mountain and subpolar glaciers, http://maps.grida.no/go/graphic/sea_level_rise_due_to_the_melting_of_mountain_and_subpolar_glaciers (Last visited March 25, 2007).
maps.grida.no /go/graphic/sea_level_rise_due_to_the_melting_of_mountain_and_subpolar_glaciers   (706 words)

 Sea Level
Sea level is considered to be one of the fundamental measures of millennial scale climate change, not only because it is a proxy of global ice volume, but also because it changes the Earth's climate boundary conditions by periodically flooding or exposing the continental shelves and opening or restricting critical passages for ocean currents.
Isostatic adjustments due to former ice sheets and sea level rise associated with the last deglaciation continue to the present day and lead to significant corrections to modern sea level estimates measured with the global array of tide gauges.
Our most detailed sea level record comes from Barbados and nearby Caribbean islands were we take advantage of the simple coral depth zonation (simple compared to the Pacific) and the dominance of the reef crest species Acropora palmata in the shallowest five meters, thus providing a reliable sea level indicator.
radiocarbon.ldeo.columbia.edu /research/sealevel.htm   (1299 words)

 Sea Level, Ice, and Greenhouses -- FAQ
This is well under the rates of sea level rise experienced during the end of the last ice age (around 20 mm/year), so is not ecologically unprecedented.
The Filchner-Ronne (in the Weddell Sea) and the Ross Ice shelf (in the Ross Sea) act as buttresses to the West Antarctic ice sheet.
Sea level during the last 17,000 years: Fairbanks, R. A 17,000 year glacio-eustatic sea level record: influence of glacial melting rates on the Younger Dryas event and deep-ocean circulation.
www.radix.net /~bobg/faqs/sea.level.faq.html   (2898 words)

 NASA GISS: Science Briefs: Sea Level Rise   (Site not responding. Last check: )
Sea level could rise 40 to 65 cm by the year 2100, due to predicted greenhouse-gas-induced climate warming.
Such a sea level rise would threaten coastal cities, ports, and wetlands with more frequent flooding, enhanced beach erosion, and saltwater encroachment into coastal streams and aquifers.
However, future sea level is very difficult to predict, because not enough is known about how the ice sheets in Greenland and Antarctica will react to global warming.
www.giss.nasa.gov /research/briefs/gornitz_01   (348 words)

 "Florida fishing at it's finest. Fishing Florida waters with Sea Level Family Flats Fishing Charters is more than ...
Sea Level Family Flats Fishing Charters is a Florida fishing charters service that operates with only four of the best Florida fishing guides in the business.
Sea Level Family Fishing Charters is a Florida fishing charter service that operates with only four of the best Florida fishing guides in the business.
Sea Level Family Fishing Charters is a Cape Coral, Florida fishing guide service that specializes in saltwater backcountry flats fishing the waters of southwest Florida’s Pine Island Sound, Sanibel Island, Captiva Island and the surrounding waters of Pine Island including, Matlacha Pass, Ding Darling National Wildlife Refuge and all associated keys, islands, rivers
www.fishsealevel.com   (1243 words)

 Read about Above mean sea level at WorldVillage Encyclopedia. Research Above mean sea level and learn about Above mean ...   (Site not responding. Last check: )
It should be noted that the concept of a "mean sea level" is in itself rather artificial, because it is not possible to determine a figure for mean sea level for the entire planet, and it varies quite a lot even on a much smaller scale.
This is because the sea is in constant motion, effected by the high and low pressure zones above it, the tides, local gravitational differences, and so forth.
Cornwall for their maps of Great Britain, and this datum is actually some 80cm different from the mean sea level reading obtained on the other side of the country.
encyclopedia.worldvillage.com /s/b/Above_mean_sea_level   (430 words)

 Sea level rise
A global average sea level rise of 9-88 cm (3.5–34.6 inches) is expected over the next hundred years, thanks to the greenhouse gasses we have emitted to date and likely future emissions.
There is actually a fair amount of difference in sea level rise in different parts of the world due to ocean circulation and wind pressure patterns.
This did not directly add to sea level rise since the ice shelf was already floating, but it was a dramatic reminder of the effects of warming in the area.
www.greenpeace.org /china/en/campaigns/stop-climate-change/impacts/sea-level-rise   (1208 words)

 November 15, 2001: Rising Sea Level Forcing Evacuation of Island Country
Sea level is rising because of the melting of glaciers and the thermal expansion of the ocean as a result of climate change.
In his words, his country of 311,000 was "an endangered nation." With most of its 1,196 tiny islands barely 2 meters above sea level, the Maldives' survival would be in jeopardy with even a 1-meter rise in sea level in the event of a storm surge.
The most easily measured effect of rising sea level is the inundation of coastal areas.
www.earth-policy.org /Updates/Update2.htm   (1287 words)

 Sea Level Rise and the Maldives
Sea level rise, however, would reduce the freshwater storage capacity of Male, as well as any adjacent islands that might be a supplemental source.
Although sea level rise does not immediately threaten this island with inundation--even a one meter rise would leave it less vulnerable than Male is today, agriculture could be hurt.
Although the Maldives are one of the most vulnerable nations, rising sea level does not threaten national survival, provided appropriate measures are taken in response to and in anticipation of the problem.
users.rcn.com /jtitus/Maldives/Small_Island_States_3.html   (2814 words)

 Globalwarming awareness2007: Sea Level, Global Warming
raising sea level through a combination of increased water from glacier melting and warmer water temperatures causing expansion.
Sea level has risen 4 to 10 inches this past century and is projected to rise up to 3 feet by 2100.
abrupt sea level rise due to rapid melting of the Greenland ice Sheet.
www.global-warming-awareness2007.org /Globalwarming-awareness2007-Sea.html   (303 words)

 NASA - Scientists Get a Real "Rise" Out of Breakthroughs in How We Understand Changes in Sea Level
Beyond merely the sloshing of waves that we all recognize along the beaches of the world, sea level describes a complex array of conditions, from chemistry to temperature to changes in the shape of the basins that hold the world's water.
Sea levels rise and fall as oceans warm and cool and as ice on land grows and shrinks.
Other factors that contribute to sea level change are the amount of water stored in lakes and reservoirs and the rising and falling of land in coastal regions.
www.nasa.gov /vision/earth/environment/sealevel_feature.html   (681 words)

 EPA : Global Warming : Resource Center : Publications : Sea Level Rise : The Probability of Sea Level Rise   (Site not responding. Last check: )
The estimates of sea level rise are somewhat lower than those published by previous IPCC assessments, primarily because of lower temperature projections.
If a high global rate of emissions growth occurs in the next century, sea level is likely to rise 6.2 mm/yr by 2100; freezing emissions in 2025 would prevent the rate from exceeding 3.2 mm/yr.
If these factors do not change, global sea level is likely to rise 45 cm by the year 2100, with a 1 percent chance of a 112 cm rise.
yosemite.epa.gov /oar/globalwarming.nsf/content/ResourceCenterPublicationsProbability.html   (1485 words)

 Ice Core Research | Sea Level Rise   (Site not responding. Last check: )
Ice that calves into the ocean becoming a floating ice berg has the same effect on sea level as ice that melts and flows as liquid water into the ocean.
There are two major ice caps in the world that would have a global effect on sea level if they were to melt: the Antarctic ice cap and the Greenland ice sheet.
Estimates of sea level rise are made by dividing the water volume of an ice sheet by the total surface area of the oceans in which they will melt.
www.secretsoftheice.org /icecore/sealevel.html   (353 words)

 Sea level   (Site not responding. Last check: )
Mean sea level at a given point is the average of that level when one has taken into account such things as tides and wave action.
Mean sea level at the Pacific end of the Panama Canal is 20 cm higher than at the Atlantic end.
Over an extended period mean sea level will be affected by global warming in at least two ways: the run-off from melting glaciers on land, and the increased volume reflecting the coefficient of expansion of water.
www.freetemplate.ws /se/sea-level.html   (614 words)

 Topex/Poseidon and Jason-1 Equatorial Pacific Sea Level Analysis   (Site not responding. Last check: )
The Jason sea level anomalies are computed from the peliminary IGDR data using the medium accuracy orbit ephemeris (MOE).
Although this orbit is not as accurate as the later precise ephemeris, tests over the 6 month overlap indicate that with the filtering used, the recovered sea level anomaly maps agree with those generated from the T/P data with precise orbits at the 2-3 cm RMS level.
Sea level remained low throughout the central and eastern Pacific for the remainder of 1998.
www.csr.utexas.edu /eqpac   (838 words)

 Sea Level Data
The data are hourly, daily, and monthly sea level values from stations in tropical and subtropical areas of the Pacific, Atlantic, and Indian Oceans.
Sea Level Data CD-ROM - This disc holds hourly, daily, and monthly TOGA sea level data from 289 stations through July 1994 (recent data can be obtained online from JASL, above).
The latter were provided to the NODC by the Permanent Service for Mean Sea Level, Bidston, UK.
www.nodc.noaa.gov /General/sealevel.html   (345 words)

 BBC NEWS | Science/Nature | Sea level rise 'under-estimated'
Current sea level rise projections could be under-estimating the impact of human-induced climate change on the world's oceans, scientists suggest.
The team from Germany and the US found that for the timescale relevant to human-induced climate change, the observed rate of sea level rise through the 20th Century held a strong correlation with the rate of warming.
He added that only 40% of observed sea level rise was believed to a result of thermal expansion.
news.bbc.co.uk /2/hi/science/nature/6179409.stm   (529 words)

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